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- W2019991332 abstract "The transplantation of T cell-depleted HLA-haploidentical bone marrow can correct the severe combined immunodeficiency disease (SCID) caused by the inherited absence of T lymphocytes. Despite a different environment, no severe graft-vs.-host reaction occurred and engrafted T lymphocytes became functional. We have studied tolerance of engrafted T lymphocytes to donor and host HLA antigens in four SCID patients who have been transplanted with bone marrow from one of their HLA-haploidentical parents. Graft-vs.-host reaction was prevented by T cell depletion of infused bone marrow using E rosetting and by in vivo administration of cyclosporine A. Subsequent to bone marrow transplantation (BMT), the engrafted T lymphocytes were shown to be unresponsive in vitro towards host cells collected prior to BMT. Generally, this tolerance could not be explained by a suppressive mechanism. Nevertheless, in one patient suppressive cells were found transiently. In contrast to the early appearance of a tolerance towards host, a reactivity of engrafted donor cells towards donor was always observed within the first 300 days post-grafting. This auto-reactivity was mediated by T cells of donor origin and its targets were HLA class II molecules (at least HLA-DR and DQ). The progressive disappearance of this auto-reactivity was correlated with the engraftment of Ia-positive cells (monocytes plus B lymphocytes) of donor origin and the achievement of complete immunological reconstitution. In the patient showing the strongest autoreactivity, a donor-specific T cell line has been grown which was shown to specifically inhibit the proliferative response of donor lymphocytes. Concomittantly, the immunological reconstitution remains poor in this patient. These data suggest that tolerance to HLA class II molecules is dependent on the presence of the relevant HLA class II molecule-expressing cells allowing the elimination or the suppression of T lymphocytes specifically directed at these molecules." @default.
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- W2019991332 date "1986-01-01" @default.
- W2019991332 modified "2023-10-16" @default.
- W2019991332 title "Self-tolerance to host and donor following HLA-mismatched bone marrow transplantation" @default.
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- W2019991332 doi "https://doi.org/10.1002/eji.1830160202" @default.
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